I have endo and pelvic floor dysfunction, the thing that causes bloating or endo belly is often pelvic floor dysfunction since the muscles are tensed and can't relax so they just go out.
Whenever I get endo belly I get sciatica pain and pain in my lumbar spine. I also have pain with deep penetration at drs appointments but it's called down a bit.
I would've waited for the physiotherpist or found another one yourself search up Pelvic Floor physiotherapists in your area, well your waiting though there's a few things you can do:
1. Internal Massage:
Make a circle with your hand and trace inside it with a finger on your other hand, slowly applying pressure but not too much. Now move down to you vagina and do a kegel, you should feel a muscle tense up inside, do the same massage you did with your finger there for 2 minutes on each side. Do a set of your 10 10 seconds kegels and 3 quick kegels (1 second tense, 1secodns release) masage again for 5 minutes.
2. Yoga & Stretching:
Sets of 4 for 20 seconds- Standing Quad stretch, lunge, cobra, child's pose (on the last set don't do cobra)
3. Limit abb workouts:
So your pelvic floor is already tensed up and causing issues all over, if you work on your abb muscles all that's going to happen is your going to work on already tensed muscles and they might just 'snap' in your pelvis (it's happened to me in my PC muscle). Some abb workouts are safer then others, you need to make sure you aren't lifting your legs to your stomach so no crunches, sit-ups, chin ups or anything of that nature.
Don't do squats until you figure this out too, I find squats cause this pain the most.
4. Try not to curl up in fetal position when your in pain (it's going to be tuff)
5. Don't wear tampons:
Odd thing but it's like those yoni eggs that people use to make their vaginas 'tighter', when you have a tampon in with endo everytime your in pain that makes you clench your stomach you do a few kegels. Which is making your muscles tighter by wrapping around a tampon which is really small. I found that they made my cramps worse but what I did was change them more often and stop wearing them once I was home.
Hope these help, feel free to message me for questions or just reply